Move solution and projects to src

src/Ryujinx.Audio/Renderer/Server/Upsampler/UpsamplerBufferState.cs

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+using Ryujinx.Common.Memory;
+
+namespace Ryujinx.Audio.Renderer.Server.Upsampler
+{
+    public struct UpsamplerBufferState
+    {
+        public const int HistoryLength = 20;
+
+        public float Scale;
+        public Array20<float> History;
+        public bool Initialized;
+        public int Phase;
+    }
+}

src/Ryujinx.Audio/Renderer/Server/Upsampler/UpsamplerManager.cs

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+using System;
+using System.Diagnostics;
+
+namespace Ryujinx.Audio.Renderer.Server.Upsampler
+{
+    /// <summary>
+    /// Upsampler manager.
+    /// </summary>
+    public class UpsamplerManager
+    {
+        /// <summary>
+        /// Work buffer for upsampler.
+        /// </summary>
+        private Memory<float> _upSamplerWorkBuffer;
+
+        /// <summary>
+        /// Global lock of the object.
+        /// </summary>
+        private object Lock = new object();
+
+        /// <summary>
+        /// The upsamplers instances.
+        /// </summary>
+        private UpsamplerState[] _upsamplers;
+
+        /// <summary>
+        /// The count of upsamplers.
+        /// </summary>
+        private uint _count;
+
+        /// <summary>
+        /// Create a new <see cref="UpsamplerManager"/>.
+        /// </summary>
+        /// <param name="upSamplerWorkBuffer">Work buffer for upsampler.</param>
+        /// <param name="count">The count of upsamplers.</param>
+        public UpsamplerManager(Memory<float> upSamplerWorkBuffer, uint count)
+        {
+            _upSamplerWorkBuffer = upSamplerWorkBuffer;
+            _count = count;
+
+            _upsamplers = new UpsamplerState[_count];
+        }
+
+        /// <summary>
+        /// Allocate a new <see cref="UpsamplerState"/>.
+        /// </summary>
+        /// <returns>A new <see cref="UpsamplerState"/> or null if out of memory.</returns>
+        public UpsamplerState Allocate()
+        {
+            int workBufferOffset = 0;
+
+            lock (Lock)
+            {
+                for (int i = 0; i < _count; i++)
+                {
+                    if (_upsamplers[i] == null)
+                    {
+                        _upsamplers[i] = new UpsamplerState(this, i, _upSamplerWorkBuffer.Slice(workBufferOffset, Constants.UpSampleEntrySize), Constants.TargetSampleCount);
+
+                        return _upsamplers[i];
+                    }
+
+                    workBufferOffset += Constants.UpSampleEntrySize;
+                }
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Free a <see cref="UpsamplerState"/> at the given index.
+        /// </summary>
+        /// <param name="index">The index of the <see cref="UpsamplerState"/> to free.</param>
+        public void Free(int index)
+        {
+            lock (Lock)
+            {
+                Debug.Assert(_upsamplers[index] != null);
+
+                _upsamplers[index] = null;
+            }
+        }
+    }
+}

src/Ryujinx.Audio/Renderer/Server/Upsampler/UpsamplerState.cs

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+using System;
+
+namespace Ryujinx.Audio.Renderer.Server.Upsampler
+{
+    /// <summary>
+    /// Server state for a upsampling.
+    /// </summary>
+    public class UpsamplerState
+    {
+        /// <summary>
+        /// The output buffer containing the target samples.
+        /// </summary>
+        public Memory<float> OutputBuffer { get; }
+
+        /// <summary>
+        /// The target sample count.
+        /// </summary>
+        public uint SampleCount { get; }
+
+        /// <summary>
+        /// The index of the <see cref="UpsamplerState"/>. (used to free it)
+        /// </summary>
+        private int _index;
+
+        /// <summary>
+        /// The <see cref="UpsamplerManager"/>.
+        /// </summary>
+        private UpsamplerManager _manager;
+
+        /// <summary>
+        /// The source sample count.
+        /// </summary>
+        public uint SourceSampleCount;
+
+        /// <summary>
+        /// The input buffer indices of the buffers holding the samples that need upsampling.
+        /// </summary>
+        public ushort[] InputBufferIndices;
+
+        /// <summary>
+        /// State of each input buffer index kept across invocations of the upsampler.
+        /// </summary>
+        public UpsamplerBufferState[] BufferStates;
+
+        /// <summary>
+        /// Create a new <see cref="UpsamplerState"/>.
+        /// </summary>
+        /// <param name="manager">The upsampler manager.</param>
+        /// <param name="index">The index of the <see cref="UpsamplerState"/>. (used to free it)</param>
+        /// <param name="outputBuffer">The output buffer used to contain the target samples.</param>
+        /// <param name="sampleCount">The target sample count.</param>
+        public UpsamplerState(UpsamplerManager manager, int index, Memory<float> outputBuffer, uint sampleCount)
+        {
+            _manager = manager;
+            _index = index;
+            OutputBuffer = outputBuffer;
+            SampleCount = sampleCount;
+        }
+
+        /// <summary>
+        /// Release the <see cref="UpsamplerState"/>.
+        /// </summary>
+        public void Release()
+        {
+            _manager.Free(_index);
+        }
+    }
+}